Changeable combination key-lock.



PATENTED MAR. B, 1906.

w. H TAYLOR, CHANGEABLE COMBINATION KEY LOOK.

APPLICATION FILED EELY 1. 1905.

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f A Home W! TNESSES V 1%. 814,335. PATENTED MAR. 6, 1906.

W. H. TAYLOR.

GHANGEABLB COMBINATION KEY LOCK.

APPLIOATIOH FILED JULY 1, 1965.

2 SHETS-SHEBT 2 {jinn Eh I I IVfT/VESSES V A f J,

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I 5 Anm-ng WARREN H. TAYLOR, OF STAMFORD,

YALE & TOWNE MANUFACTURING unorroo'r.

CONNECTICUT, ASSIGNOR TO THE COMPANY, OF STAMFORD, CON- CHANGEABLE OOMBI NATION KEY-LOOK- Specification of Letters Patent. 7 Application filed July 1, 1905. Serial 1a. 281,936.

Patented Karen 6, 1906.

To all whom it may concern:

Be it known that I, WARREN H. TAYLOR, of

i I Stamfo d, in the county of Fairfield' and State will enable others skilled in the of Co eoticut, have invented certain new and usefol Improvements in Changeable Combinat on Key-Locks; and I do hereby declare the followin to be a full, clear, and exact "description the invention, such as art to which it fipertains to make and use the same.

y invention relates to an improvement in changeable combination key-locks designed more particularly for safe-deposit boxes, and icon 1m rovement on the lock disclosed in Patent 0. 690,537, granted to me January In the patent above referred to the change in the combination can only be effected when the bolt is retracted, and a cam-stop which is l normall from the rear of the lock operates to revent the key-hub and the changeey t erein from bei turned to a .plf'isition where the key can e withdrawn cm the look when the latter is unlocked or the bolt retracted. Hence to withdraw the key from the lock for the pu ose of changing the combination which is e ected by the insertion 0f-8I10tl181' key this eam-sto which, as before stated, is accessible-from t e rear, is moved to a position out of the path of the cam on the key-hub, thus permitting the latter to be moved to a position where the key A can be removed. The fact that the cam-stop is accessiblewhen the door is open makes it possi 1e for the custbdian or attendant in charge of the safe-deposit boxes to change the combination without the knowledge of the owner of the box and in this way am accessto the box without the use of t e key held by the owner.

The present improvement therefore, con sists in the adding of another locking mechanism actuated by a keyrwhich will control the changin of the lock om its adaptation to a phangeey of one form to that of another orm.

My invention further consists in the parts and combinations of parts, as will be more via described, and pointed out in the claims.

the accompanying e1 is wings a view in elevation of my improved lock with the face-plate of the casing removed and the bolt in its locked position. fig. 2 is a similar view showing the guard-key mechanism in a adapted to enga e t pass out of the gating-s position to release the key-hub, the latter partly turned and the safety lockinidevice moved out of the path of the key-bu Fig.

3 is a similar view showing the bolt retracted and the key-hub turned to its position tore ceive a new change-key. A Fig. 4 is a view of the casing, bolt, and safety loo mechanism, the latter being turned by its ey out of the path of the cam on the he -hub. Fig. 5 is a view of a modified form 0 safety iockmg mechanism, and Figs. 6 and I are views in side and end elevations of the latter.

A represents the lock-casing, and B the bolt sli 1y mounted therein and provided with an e o ated slot 11' for the passe e of the fixed stu a, on which the tum lers are mounted. Secured to the casing near its front end and in a position ad'acent to the bolt B is a stationary spline This stationary spline His rovided with a tooth c,

enotches d in the movable or changee 1e fence or fences G, which latter-are slidingly mounted on and carried by the bolt vB.

There is a fence G for each tumbler E, and each fence is provided with a series of notches d for engaging the teeth 0 of the stationary spline, an each is also provided adjacent to its ends with the elongated slots 6, through which the pins f, carned by the bolt, pass, and with a rearwardly-projectin tongue g, designed to enter the gating h in t e tumbler. These fences are moved to their proper posi tions by the tumblers and must necessarily remain undisturbed when once move Hence in order to revent one fence from mo another by 'ctional contact therewith locate the thin plates i between the several fences and also preflerably on or against the outer face of the outer fence, and

as these spacing orfriction plates are secured 9 5 to the pins f the several fences are separated and prevented from imparting movement to the adjacent fences. Again, these fences are restrained against accidental movement when once set by their res ective tumblers the frictional contact 0 the friction or spa gv 7 plates. Hence after the tongues of the fen U in the tumblers pre ging the tongue on the stati'onary spline the fences G in retained in their respective itions b the frictional contact of the ates *1. These spacing or friction plates a engage and separate the paratory to e free ends of the tumblers, as clearly shown it t Figs. 1 and 2, and hold them against any undue accidental movement and properly space (1 to engage their respective fences.

N is a recess formed in the ed e of the bolt for the operation of the cam K 0 the key-h ub K. This cam when turned engages the s ide walls of the recess and slides the bolt back and forth. The key-hub K is provided v with two slits to receive the two keys.

Mounted on the stud a adjacent to the bolt is the sprin -pressed tumbler L, the from; end of which w on the bolt is retracted rents in the ath of the cam K and prevents the latter om .completing a half-revolution, which is necessary in order to bring the key to a osition where it may be withdrawn. he combination under which the bolt is locked is, however, regulated b the key which throws the bolt to a locke position. Hence in order to change the comblnation it is necessary to change keys when the bolt is in its unlocked position, and in order to permit of the removal of the key I provide a safetylook, which consists of the tumbler L above referred to, actuated by a safety-kc L introduced from the rear face of the ock-casing near its rear end. This key should be in the custody of some oflicial other than the regular attendant or custodian of the boxes and is only used when it is desired or necessary to chan e the combination, as would be the case at the time of the rental of a box or where a key has been lost. By insertin the safety-key and turning the same the sa etytumbler will be moved out of the path of cam K, thus permitting the key-hub to continue its turning movement and complete its halfturn, in which position the change-key can be Withdrawn, a new one introduced, and the combination changed by the act of throwing the bolt to its locked position, as will be hereinafter explained.

In throwin the bolt to its locked position the tumbler 1% and permit the cam K to pass and will then automatically fall into its normal position in rear of the cam. From this it will be seen that unless the safety-tumbler L be removed 1 or elevated, as above explained, the changekey cannot be removed when the lock is unlocked.

In Fig. 4 I have shown the safetylock of the iii-tumbler variet and connected to the tum bler L by the in By referring to ig. 2 it will be seen that when a change-key is introduced and turned and each bitting of the key engages its corresponding tumb er the fences of the several tumblers will be raised to the articular heights corresponding to the hitting of the ke Now as the key continues to turn the b0 t moves forward and the movable or changeable fences all en age the stationary spline H and will be he d at the particular will yield under the pressure,

, turning movement its front end enga amass with which the look was locked. Conseuently when this same key is again inserted f or retractin the bolt it will again raise the tumblers to t eir proper positions relative to their respective fences, so that the tongues or arms of the several fences will slide into the gratings of their respective tumblers. If,

owever, a different he be inserted, the gatings in the tumblers wi 1 not re ister with the tongues or arms of the fence, t us absolutel preventing the unlocking of the lock with an other key than the one employed for ice n it.

It SiOllld be borne in mind that the bittings of the keys must bear a certain fixed relation to the notches in the changeable fences, so that when the key is operated the raising of the tumblers will raise the changeable fences to just the right points, so that they will engage properly with the stationary spline H. i

Althou h the mechanism above described is applica Is to looks of an type, I have shown it in connection with a guard-ks mechanism which is used in connection wit safe-deposit locks or other locks where the presence of a custodian or other person holdmg a second key is necessary be ore the lock can be unlocked. This guard-key mechanism com rises one or a series of tumblers F, mounts on the stud 7' and each provided with a gating to receive the fence C on guardlever C. This guard-lever is approximately triangular in shape and is designed at its rear end to be engaged by the bolt B, which 0 crates to reset. the guard mechanism, WllHB its front end is designed to en age the camlocking lever D, as shown in iigs. 1 and 2. This second setof tumblers F is engaged by a guard-key inserted in the second slot in the ey hub or plug K, and when moved by the key the gatin s in their ends are brought into line with the ence C" on guard-lever G, thus permitting the latter to turn. During this the cam-locki lever D and carries the ooked end thereo out of the ath of the cam K. This hooked end norm 1y rests in the path of the cam K and prevents it from being turned sufficiently to throw the bolt to an unlockedpositio The nerd-lever is, as before explained, re-

set or t own off by the rearward movement of the b013, and in addition it may be reset or thrown o by a throw oif key. One of the nerd-tumblers is provided with a tongue which latter moves in the path of a pin F, projecting from the ard-lever C, and which when moved by a y strikes the pin F and turns the ard-lever to its normal locked 1position. heobject of the tongue F is as fo ows: Should the attendant or guard who carries the guard-kc by mistake put in his guard key and set guard tumblers be forced out of the way by the cam K, and

turning of a keywhen the bolt is retracted,

.45 the bolt isretracte ,and a key for after the latter has passed itfalls back into the path of the cam and revents the look from bein unlocked until t e uard mechanism shall ave been first unloc ed.

The main tumblers E, guard-tumblers F,

cam-locking lever D, and safety-tumbler L are each rovided with a flat wire spring for holdin them in their normal positions, and the sa et -tumbler L is yieldingly held by its spring against a small stud, (shown in Figs. 1 and 2,) which stud prevents the spring from moving the safety-tumbler L out of the path of the safet -key, which, as before ex lained, is employe for actuatin said tumb er.

While I have shown in igs. 1, 2, and 3 the ordinary form of lock and in Fig. 4 a pintumbler look, I would have it understood that I do not confine myself to any particular construction of lock, nor is it essential that a lock with guard-tumblers be em loyed, as m invention comprehends, broa 2y, a lock wherein a safety-lock actuated by an independent key is empioyed for preventing the withdrawal of the main key when the bolt is retracted except after the safety-lock has been actuated b its roper key.

Having V lly escribed my invention, what I claim as new, and desire to secure by Lettel-s Patent, is- V 1. In a changeable key-lock wherein the combination is changed by the insertion and thepombination with a bolt and tumbiers, of a} safety locking device for preventing the main key from being turned to a position where the main he can be removed gvhen the safety locking device.

2. Ina changeable key-lock, the combinetion with a bolt and tumblers, of a safety locking device which musthe 0 erated by a key before the main tumblers o' the lock can be reset to confrn'in to the bittings of a different form of change-key.

3. In a changeable key-lock, the combination with. a bolt and a series of tumblers carried thereby, of a main key-hub for actuatin the bolt, and a safety locking device for said main key-hub, which must be operated b its key before the main tumblers of the loo can be reset.

4. In a chan eable key-lock, the combination with a bolt, a tnrsbier carried thereby and a key-hub having a cam for moving the belt, of a safety locking device for limiting the throw of the cam and a key for actuating the safety locking device, whereby the main key-hub may be tnrncd to a position where the main key can be removed While the bolt is in its retracted position, and a new changekey inserted.

5. In a changeable key-lock the combination with a bolt, tumblers thereon and a main key-huh having a key-slot opening at the front of the. lock and having a cam for moving the bolt, of a safety locking device having its key-opening in the rear face of the lock-casing and adapted to limit the turning movement of the main key-hub, ands key for actuating the safety locking device;

6. In a changeable key-lock the combination with a lock-easing, a bolt therein, tumbiers carried by said bolt and a main key-hub having its key'slot opening in the front face of the casing, of a safety locking device for limiting the movement of the he '-hub and having its key-opening in the rear ace of said casing and a key for said safety locking device.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

WARREN H TAYLOR Witnesses:

SGHUYLER MERRI'TT,

F. T. Towns. 

